SynchronizedKeyedCollection<K, T> Constructor (Object, IEqualityComparer<K>, Int32)

Initializes a new instance of the SynchronizedKeyedCollection<K, T> class with access synchronized by an explicitly specified object and with keys compared in a specified way.

Namespace:  System.Collections.Generic
Assembly:  System.ServiceModel (in System.ServiceModel.dll)

protected SynchronizedKeyedCollection(
	Object syncRoot,
	IEqualityComparer<K> comparer,
	int dictionaryCreationThreshold


Type: System.Object

The object used to synchronize access to the thread-safe collection.

Type: System.Collections.Generic.IEqualityComparer<K>

The IEqualityComparer<T> of type K used to compare key objects of type K for equality.

Type: System.Int32

The number of items required to create a dictionary for the collection.


syncRoot is null or comparer is null.


dictionaryCreationThreshold is less than -1.

Setting dictionaryCreationThreshold to -1 assigns the MaxValue (2,147,483,647; hexadecimal 0x7FFFFFFF) to it.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
© 2014 Microsoft